|Publication number||US5060401 A|
|Application number||US 07/478,369|
|Publication date||Oct 29, 1991|
|Filing date||Feb 12, 1990|
|Priority date||Feb 12, 1990|
|Also published as||DE69119067D1, DE69119067T2, EP0515531A1, EP0515531A4, EP0515531B1, WO1991011927A1|
|Publication number||07478369, 478369, US 5060401 A, US 5060401A, US-A-5060401, US5060401 A, US5060401A|
|Inventors||Ian H. Whatley|
|Original Assignee||Whatley Ian H|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (13), Referenced by (91), Classifications (10), Legal Events (10)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This invention relates to cushioning devices for footwear.
Stubblefield, U.S. Pat. No. 4,372,058, describes a shoe sole having a tread which defines a longitudinally and/or laterally oriented concavity. The lower extremities of the sole are formed by downwardly and outwardly disposed flexible lugs which cushion the foot of a wearer against impact loads. Stubblefield, U.S. Pat. No. 4,449,307, describes a basketball shoe sole having a central longitudinally arranged support wall.
Parracho et al., U.S. Pat. No. 4,402,146 disclose a sole having side tabs extending from the outsole to the shoe upper. These tabs are designed to stabilize the midsole and reduce ankle fatigue.
Stirtz et al., U S. Pat. No. 4,297,796, describe an inner sole member formed of an open mesh web. The web includes elongated interwoven stretch resistant strands disposed at oblique angles relative to the longitudinal axis of the shoe. The strands act as force transmitters with respect to the sole member.
Bowerman et al., U.S. Pat. No. 4,128,950, describe a multilayered athletic shoe sole formed of synthetic plastic foam positioned between a hard outsole and an upper. A lateral extending heel stabilizer plate of solid plastic material is added to improve lateral stability.
The invention features an article of footwear, for example, an athletic shoe designed for walking, running, or other sports activities. The article of footwear is provided with an upper, an outsole, and a midsole positioned between the outsole and the upper. The midsole has an upper surface upon which a sole of a foot is positioned during use of the article. The term "midsole" is meant to include any cushioning or other device placed within the footwear upon which a foot is positioned during use of the article. The midsole is also provided with an external cushioning spring. This spring includes an angled strip of resilient elastic material. One end of the strip is fixed on the surface of the midsole or outsole at a location at least 3 mm below the upper surface of the midsole. The other end of the strip is fixed on the surface of the midsole at least 3 mm vertically above the location at which the one end is fixed. The external cushioning spring is fixed in a manner such that a vertical force on the footwear created by a wearer of the footwear striking the outsole on a solid surface causes the angled strip to bend between its ends, thereby absorbing a portion of the force.
The term "angled" is used in a broad sense in this application to encompass any shape of material having a bended portion which acts to absorb a portion of a vertical force applied to two ends of that bended portion. Thus, it includes use of an angled strip, as shown in the drawings, having a less resilient material filling in any gap between the two ends of the bended portion to give the appearance of an unbent strip of material. Such an angled strip is functionally equivalent to those shown in the drawings.
The phrase "vertically above" includes not only a structure in which the ends of the strip are fixed directly above one another, but also a structure in which one end is vertically displaced, but not directly above the other end.
In preferred embodiments, one end of the spring is fixed to the footwear at a junction between the outsole and the midsole, or at a junction between the midsole and the upper; and the spring includes an extension formed generally perpendicular to the angled strip and adapted for insertion between the outsole and midsole or the midsole and upper, most preferably the extension is fixedly connected to the angled strip.
In other preferred embodiments, the angled strip is in the form of a U, V, Z, or hairpin shape, and is fixed to the footwear at a heel portion; the external cushioning spring includes a heel cup attached to the angled strip, and is fixed to the footwear by adhesive; both of the ends of the angled strip are attached to the midsole; the footwear includes a plurality of external cushioning springs; the angled strip is applied along its length to the surface of the midsole; the angled strip is attached in the ball region of the footwear; and the angled strip is formed of plastic, rubber, or metal or carbon fiber.
In a related aspect, the invention features a method for making an article of footwear. The method includes the steps of providing an upper, an outsole, and a midsole. The midsole has an upper surface upon which a sole of a foot is positioned during use of the article. The method includes providing an external cushioning spring including an angled strip of resilient elastic material. The method features fixing the midsole between the upper and the outsole; fixing one end of the angled strip on the surface of the midsole or outsole at a location at least 3 millimeters below the upper surface of the midsole; and fixing the other end of the angled strip on the surface of the footwear at least 3 millimeters vertically above the location at which the one end is fixed.
In preferred embodiments, the method includes providing a spring having an extension formed generally perpendicular to the angled strip, and adapted for insertion between the outsole and midsole, or between the midsole and the upper; and at least one of the fixing steps includes fixing one end of the angled strip to the article of footwear by adhesive. Generally, the spring is formed as a planar piece of material or formed to follow the contours of the footwear.
This invention provides an article of footwear, generally a shoe, which is designed to absorb some of the forces caused by the wearer of the footwear landing or moving quickly during walking, running, or other sports activities. Generally the footwear is provided with one or more curved, angled or zigzagged pieces (collectively termed "angled" in this application) of resilient elastic material connected to the footwear at two points. The lower point is 3 millimeters or more below the plane of the sole of the foot in the footwear, and the upper point is at least 3 millimeters above this point, and preferably at the level of the plane of the sole of the foot. When a vertical or near vertical force is applied to the footwear the two points at which the resilient material is connected are pushed closer together. This causes the angled portion of the material to be bent and absorb a portion of the energy. As the foot lifts away from the ground, the element will return to its original shape and thus returns some of the stored energy to the wearer. Optimum results are observed when the spring portion is placed at the heel and/or under the metatarsal heads. Such locations provide most efficient protection from foot-ground reaction forces, and for energy return. In addition, by placing the spring on the surface of the sole, midsole, and upper it provides a stablizing effect on the gait of the wearer. Thus, it helps to prevent the foot from rolling to the outside or inside edge of the footwear. In this way the spring is an aid to persons suffering from pronation.
The spring is particularly advantageous when used on athletic footwear for persons running at high speeds, e.g., during races, and for persons who constantly jump up and down, e.g., in basketball. Because of the shock-absorbing effect of the springs the vertical impact forces associated with such sports are reduced, and thus chronic and acute injuries to the lower limbs prevented or reduced. When used to prevent pronation of the user, it is desirable to place springs only one on side of the footwear, rather than on both sides. Alternatively, springs having differing resilience may be placed on either side to provide protection against vertical forces applied to the foot, and also prevent pronation of the wearer.
Other features and advantages of the invention will be apparent from the following description of the preferred embodiments thereof, and from the claims.
The drawings will first briefly be described.
FIG. 1A is a isometric side view of an athletic shoe having springs in the heel and ball regions of the foot; FIG. 1B is an isometric view of the spring shown in the ball region; FIG. 1C is an isometric view of the spring shown in the heel region;
FIG. 2 is an isometric side view of an athletic shoe having springs in the ball and heel regions; and
FIGS. 3A-3F are diagramatic representations of various other embodiments of springs useful in the invention.
Referring to FIG. 1A, an athletic shoe 10 is formed by standard procedure having an upper 12, an outsole 14 and a midsole 16. Also provided is a ball spring 18 in the ball region of the shoe, and a heel spring 20 in the heel region of the shoe.
Referring to FIG. 1B, ball spring 18 is formed generally in the shape of a hairpin with two prongs 19, 21 lying along a plane (not shown). Also provided are two 2 tabs 22, 24 extending from the hairpin generally perpendicularly from this plane. Tabs 22 and 24 are generally planar and adapted for insertion between midsole 16 and either outsole 14 or upper 12. These tabs act to hold spring 18 on the surface of shoe 10. Lower tab 24 may be positioned between midsole 16 and outsole 14 or at any other point in midsole 16 which is at least 3 millimeters below a plane 26 on which the foot of a wearer of shoe 10 lies. If desired, tabs 22 and 24 can be removed and hair spring 18 connected to shoe 10 by adhesive, e.g., glue.
Referring to 1C, heel spring 20 is provided with a tab 26, again formed generally perpendicular to the inner surface of heel spring 20 and adapted for insertion between upper 12 and midsole 16 in the heel region. Lower portion 28 of heel spring 20 is connected to shoe 10 by a generally flat tab 30 which is positioned and held between midsole 16 and outsole 14. Alternatively, tab 30 may be connected to the outer surface of shoe 10 by adhesive. Tab 30 is connected at a location at least 3 millimeters below plane 26, i.e., where the heel of the wearer contacts the midsole.
The above springs are formed of material which absorb energy when bent but return to their original shape, or close to their original shape, after bending. Appropriate materials include plastic such as surlyn, hytrel, nylon, PVC, PU, spring steel, Delrin, or rubber (synthetic or natural). Although the Figures show only one side of a shoe, it is preferred that the springs be provided on both sides of a shoe unless designed to prevent pronation or similar problems. The shoes are formed by any standard procedure, with the spring being connected either by adhesive or by tabs as described above. If tabs are used these may be sewn directly into portions of the shoe, for example between the upper and the midsole or between the midsole and outsole.
Other embodiments are within the following claims. For example, referring to FIG. 2, there are shown springs 32 and 34 which are adhesively fixed to a shoe 36 at outsole 38 in ball region 40 and heel region 46. Heel spring 34 is also connected at a location 48 to midsole 41, and ball spring 32 at a location 44 to midsole 41. As can be seen in this embodiment the only requirements of springs useful in this invention are that they are connected at 2 points to the shoe with the lower point being at least 3 millimeters below the plane of the foot of the wearer, and the other point being at least 3 millimeters above that point in the midsole. Between the two points of connection must be an angled piece of material which will bend between the two points when subjected to a vertical force applied to the two points. The remainder of the spring may or may not be fixed to the shoe, and may have any desired design, thus providing aesthetic qualities to the shoe. Such design may extend to the shoe upper.
Referring to FIGS. 4A-4F there are shown seven other embodiments of springs suitable for use in this invention. In FIG. 4A, there is shown a spring 50 in the heel region shaped in the form of a safety pin, and connected between the midsole and upper by a tab (not shown) formed perpendicularly to the inner surface of spring 50. In the ball region is shown a spring 52 fixed by a perpendicular tab (not shown) between the midsole and upper and having a generally boomerang shaped spring attached thereto, and connected to the outsole. Referring to FIGS. 4B, 4C, 4D, 4E, and 4F, there are shown various heel springs formed as V-, U-, Z-, S- and other shapes, respectively.
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|U.S. Classification||36/25.00R, 36/114, 36/27, 36/7.8, 36/71, 36/28|
|International Classification||A43B13/18, A43B5/00|
|Mar 21, 1995||FPAY||Fee payment|
Year of fee payment: 4
|Mar 26, 1999||FPAY||Fee payment|
Year of fee payment: 8
|Jan 18, 2000||RR||Request for reexamination filed|
Effective date: 19991110
|Mar 10, 2003||FPAY||Fee payment|
Year of fee payment: 12
|Oct 7, 2003||B1||Reexamination certificate first reexamination|
Free format text: THE PATENTABILITY OF CLAIMS 1 AND 16 IS CONFIRMED. CLAIMS 2, 3 AND 15 ARE CANCELLED. CLAIMS 4, 5, 7, 17-19 AND 22 ARE DETERMINED TO BE PATENTABLE AS AMENDED. CLAIMS 6, 8-14, 20 AND 21, DEPENDENT ON AN AMENDED CLAIM, ARE DETERMINED TO BE PATENTABLE. NEW CLAIMS 23-26 ARE ADDED AND DETERMINED TO BE PATENTABLE.
|Jul 27, 2004||CC||Certificate of correction|
|Sep 22, 2006||AS||Assignment|
Owner name: CUSHION TECHNOLOGIES, LLC, TEXAS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NIKE, INC.;REEL/FRAME:018291/0043
Effective date: 20060830
Owner name: NIKE, INC., OREGON
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WHATLEY, IAN;REEL/FRAME:018291/0033
Effective date: 20050425
|Jan 8, 2008||RR||Request for reexamination filed|
Effective date: 20071010
|Aug 31, 2010||B2||Reexamination certificate second reexamination|
Free format text: THE PATENTABILITY OF CLAIMS 6-14 AND 21 IS CONFIRMED. CLAIMS 2, 3 AND 15 WERE PREVIOUSLY CANCELLED.CLAIMS 1, 4, 5, 16-20 AND 22-26 ARE CANCELLED.
|Aug 10, 2011||AS||Assignment|
Free format text: CHANGE OF NAME;ASSIGNOR:CUSHION TECHNOLOGIES, LLC;REEL/FRAME:026728/0950
Effective date: 20110721
Owner name: REMOTE VEHICLE TECHOLOGIES, LLC, TEXAS